Door structure



FIG. 1 is a perspective view of the door structure taken from a point forwardly of and upwardly to the left of the forwardly facing front surface of the door structure.

FIG. 2 is a perspective view of the door structure shown in FIG. 1 taken from a point rearwardly of and downwardly to the left of the rearwardly facing rear surface of the door structure.

FIG. 3 is a horizontal cross-sectional view of the door structure shown in FIGS. 1 and 2 taken along the line 3--3.

FIG. 4 is a horizontal cross-sectional view of the door structure shown in FIGS. 1 and 2 taken along the line 4--4.

FIG. 5 is a vertical cross-sectional view of the door structure shown in FIGS. 1 and 2 taken along the line 5--5.

FIG. 6 is a horizontal cross-sectional view of the door structure shown in FIGS. 1 and 2 taken along the line 6--6. 

The ornamental design for a door structure, as shown and described. 